MySQL Connection--排查未授權使用者(unauthenticated user)
阿新 • • 發佈:2021-11-29
排查環境
Server version: 5.7.26-29-log Percona Server (GPL)
問題描述
資料庫週期性新增幾條`unauthenticated user`的連線,連線長期未釋放導致異常。
排查方法
## 檢視使用者為unauthenticated user的PROCESS SELECT * FROM information_schema.processlist WHERE USER='unauthenticated user' LIMIT 1 \G *************************** 1. row *************************** ID: 127670873 USER: unauthenticated user HOST: connecting host DB: NULL COMMAND: Connect TIME: 965 STATE: login INFO: NULL TIME_MS: 965150 ROWS_SENT: 0 ROWS_EXAMINED: 0 1 row in set (0.01 sec) ## 根據PROCESSLIST_ID查詢對應的處理程序 SELECT * FROM performance_schema.threads WHERE PROCESSLIST_ID=127670873 \G *************************** 1. row *************************** THREAD_ID: 127670969 NAME: thread/sql/one_connection TYPE: FOREGROUND PROCESSLIST_ID: 127670873 PROCESSLIST_USER: NULL PROCESSLIST_HOST: NULL PROCESSLIST_DB: NULL PROCESSLIST_COMMAND: Sleep PROCESSLIST_TIME: NULL PROCESSLIST_STATE: NULL PROCESSLIST_INFO: NULL PARENT_THREAD_ID: NULL ROLE: NULL INSTRUMENTED: YES HISTORY: YES CONNECTION_TYPE: NULL THREAD_OS_ID: 10039 1 row in set (0.00 sec) ## 根據THREAD_ID查詢對應的連線資訊 SELECT * FROM performance_schema.socket_instances WHERE `THREAD_ID`=127670969 \G *************************** 1. row *************************** EVENT_NAME: wait/io/socket/sql/client_connection OBJECT_INSTANCE_BEGIN: 61360640 THREAD_ID: 127670969 SOCKET_ID: 200 IP: xxx.xxx.xxx.xxx PORT: 59950 STATE: ACTIVE 1 row in set (0.00 sec) ## 如果是正常請求,可以通過PROCESSLIST_ID查詢到請求應用資訊 SELECT * FROM `performance_schema`.`session_connect_attrs` WHERE PROCESSLIST_ID=128200353; +----------------+-----------------+---------------------------------------------+------------------+ | PROCESSLIST_ID | ATTR_NAME | ATTR_VALUE | ORDINAL_POSITION | +----------------+-----------------+---------------------------------------------+------------------+ | 128200353 | _client_name | pymysql | 0 | | 128200353 | _pid | 70794 | 1 | | 128200353 | program_name | /xxx/xxxx.py | 2 | | 128200353 | _client_version | 0.9.2 | 3 | +----------------+-----------------+---------------------------------------------+------------------+ 4 rows in set (0.00 sec)